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AVR495: AC Induction Motor Control Using the Constant V/f Principle and a Space-vector PWM Algorithm

  • 1.

    Features

    • Cost-effective and energy efficient 3-phase induction motor drive

    • Interrupt driven

    • Low memory and computing requirements

  • 2.

    Introduction

In a previous application note [AVR494], the implementation on an AT90PWM3 of an induction motor speed control loop using the constant Volts per Hertz principle and a natural pulse-width modulation (PWM) technique was described. A more sophisti- cated approach using a space vector PWM instead of the natural PWM technique is known to provide lower energy consumption and improved transient responses. The aim of this application note is to show that this approach, though more computation- ally intensive, can also be implemented on an AT90PWM3.

3.

AT90PWM3 Key Features

The control algorithms have been implemented on the AT90PWM3, a low-cost low- power single-chip microcontroller, achieving up to 16 MIPS and suitable for the control of DC-DC buck-boost converters, permanent magnet synchronous machines, three- phase induction motors and brushless DC motors. This device integrates:

  • 8-bit AVR advanced RISC architecture microcontroller (core similar to the ATmega 88)

  • 8K Bytes of In-System-Programmable Flash memory

  • 512 Bytes of static RAM to store variables and lookup tables dedicated to the

application program

  • 512 bytes of EEPROM to store configuration data and look-up tables

  • one 8-bit timer and one 16-bit timer

  • 6 PWM channels optimized for Half-Bridge Power Control

  • an 11-channel 10-bit ADC and a 10-bit DAC

  • 3 on-chip comparators

  • a programmable watchdog timer with an internal oscillator

AVR Microcontrollers

Application Note

7546A–AVR–12/05

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